28645720 has 16 divisors (see below), whose sum is σ = 64452960. Its totient is φ = 11458272.

The previous prime is 28645717. The next prime is 28645723. The reversal of 28645720 is 2754682.

It is an interprime number because it is at equal distance from previous prime (28645717) and next prime (28645723).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28645723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358032 + ... + 358111.

It is an arithmetic number, because the mean of its divisors is an integer number (4028310).

Almost surely, 2^28645720 is an apocalyptic number.

28645720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28645720 is an abundant number, since it is smaller than the sum of its proper divisors (35807240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28645720 is a wasteful number, since it uses less digits than its factorization.

28645720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716154 (or 716150 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 28645720 is about 5352.1696535144. The cubic root of 28645720 is about 305.9754490676.

The spelling of 28645720 in words is "twenty-eight million, six hundred forty-five thousand, seven hundred twenty".